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Mathematical Model of Heat and Moisture Transfer for Predicting Durability of Building Element

用于预测建筑构件耐久性的热湿传递数学模型

基本信息

批准号：
13650661
负责人：
MATSUMOTO Mamoru
金额：
$ 2.18万
依托单位：
Osaka Sangyo University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650661/
关键词：
Moisture Variation and Distribution Freezing Thawing Process Transient Heat and Moisture Transfer Deformation on Moisture Variation Porous Building Materials Effect of Moisture on Durability 含水(氷)率変動凍結・融解水分膨張・収縮凍結融解含水、含氷率分布非定常

项目摘要

For the purpose of prediction of moisture variation in building elements, mathematical model of heat and moisture transfer are discussed in the region above 0 degree centigrade. In the equations, waterprecipitation and air pressure are considered in the boundary conditions. Addition to results, governing equations of heat and moisture transfer under freezing are discussed and derived. In those equation, existence of liquid water even below 0 degree centigrade is assumed. Equations obtained are valid not only in freezing/thawing region but in non-freezing region. Using these equations, experimental results are analyzed of test specimen of ALC under freezing/thawing conditions. Calculated results of solid water (ice) contents and temperature distributions are reasonably agree with experimental results. In next stage, we will try to introduce chemical reactions term in the equations.On the other hand, we tried to analyze deformation of building elements due to moisture content variation and distribution. In hygroscopic region, expansion/shrinkage of wooden wall and studs are analyzed numerically under transient natural conditions at Osaka, Japan, applying governing equation mentioned above. We obtain order of deformation of each elements of wooden wall. In the analysis, non-isotropic properties are considered. Furthermore, experiments of deformation of stud under compressed conditions are perform. Compressed effects are not shown clearly.

为了预测建筑构件内部的湿度变化，本文讨论了0 ℃以上区域的热湿传递数学模型。在方程中，边界条件考虑了降水和气压。在此基础上，讨论并推导了冻结条件下的热湿迁移控制方程。在这些方程中，假设即使在0摄氏度以下也存在液态水。所得方程不仅适用于冻融区，而且适用于非冻区。利用这些方程，对ALC试样在冻融条件下的试验结果进行了分析。固体水（冰）含量和温度分布的计算结果与实验结果吻合较好。在下一阶段，我们将尝试在方程中引入化学反应项，另一方面，我们将尝试分析建筑构件由于含水量的变化和分布而产生的变形。在吸湿区，应用上述控制方程，数值分析了日本大坂瞬态自然条件下木墙和立柱的膨胀/收缩。得到了木墙各单元的变形顺序。在分析中，非各向同性属性被认为是。此外，还进行了受压状态下栓钉的变形试验。压缩效果没有显示清楚。